Process for making waterproof felted compositions



Jtine I6, 1925. 5 L. KIRSCHBRAUN PROCESS FOR- MAKING WATERPROOF FELTED COMPOSITIQNS Filed Sept. 10, 1919 2 Sheets-Sheet 1 m u I n a q a Q n a m A u 9 Y June 16, 1925.

L. KIRSCHBRAUN PROCESS FOR MAKING WATERPROOF FELTED COMPOSITIONS Filed Sept. 10. 1919 2 Sheets-Sheet 2 To all whom it may concern:

meme June, 16, was.

LESTER KIR/SOHBRAUN, CHICAGO, ILLINOIS.

PBOOESS FOR MAKING WATERPROOF FELTED' COMPOSITIONS.

Application filed September 10, 1919. seriiiiwo. 322,831.

object is accomplished withoutsticking up or gumming the machine or otherwise interfering with its operation due to the use of a normally adhesive bitumen or other similar waterproof pitch; to provide a process in which the waterproof felted composition is formed into a sheet with a fabricbacking which fabric backing is fed continuously to the machine and ineife'ct serves as a forming screen for the felted sheet; to pro vide a process which permits theformation of the sheet without the use of blankets or wire screens; to provide a process in which fibres of the felted sheet are not only mechanically interlocked with the latter during the formation of the felted sheet but are also adhesively bound thereto by the pitchy binder which is used as a saturant or waterproofing agent; to provide a novel product in which the felted sheet is interlocked with a fabric backing; and

in general to provide a process of the character referred to.

- In the drawings:

' Fig. 1 is a somewhat diagrammatic side elevation of my improved apparatus.

Fig. 2 is an end elevation of the forming cylinder.

-Referrmg to the drawings, 1 designates a vat provided with an inlet pipe 2- for stock in the vat between the fabric 9 a-nd 10 and at the lower end of vat a similar roll 11, for the purposehereinafter described. At the rear of the vat is mounted a supporting frame 12 carrying a series of suction boxes 13 and table rolls 14. At the front end of the suction box'is a dandy roll 15. At the rear end thereof are a pair of opposed pressure rolls 16 and similar rolls 17 and 17", the latter being a suction roll. At the rear of the roll 17 and 17 are still further pressure rolls 18 and then a series of drying rolls 19. The suction is applied to the suction boxes 13 and to the rolls 17' in a manner well known to those skilled in the art and need not therefore be described in .detail. The particular arrangement of these rolls canof course be modified to meet conditions. At the front ofloopers 21, the latter being used to faclhtate splicing in a well known manner. To prevent the water fromcarryin the ackof the machine is a reel'20 and a series 7 ing and the rollers on the cylinder, I provide at either side of the latter, a pair of straps 22 and 23 which serve the double function of accomplishing the process just described and also gauglng the width of the sheet being-formed. It is also to be noted that the rolls 16 are drive rolls belng driven in the usual manner from any suitable source of power (not shown) so as to carry the sheet over the machine. The water which passes through the meshes of the fabric backing and into the cylinder is drawn out through pipe 24 connected by branch 25 to suction pump (not shown). A leg 26 is provided to register the level of the water in the cylinder.

Describing the manner of carrying out the process and operating the machine, a roll of fabric backing such as burlap is mounted on a reel and fed over the loopers, thence over. the rolls 11, 10 and 9 and around the idler rolls 8. The fabric then passes under the roll 15 and through the rolls 16, 17, 17 18 and the drying rolls 19. After the fabric backing is threaded throu h the machine in the manner just describe the stock is al-' lowed to'runinto the vat. This stock may.

consist of fibrous pulp such as rags, sulphate, sulphite, newspapers or the like with sawdust added if desired and is preferably intimately mixed with a waterproof pitchy binder of a 'non adhesive character. This binder may consist of an emulsion of 001- loidal clay, water and bitumen the emulsion being so formed that the bitumen is in-the internal phase and theclay and water in the external phase. As the fabric backing passes through the vat, it picks up the fibre which isformed into a sheet as it passes over the machine, the water removed by suction and drying rolls and the bitumen thereupon becoming again adhesive and uniting with the fibre and with the fabric backing. Stock is fed over the machine in such a consistency as to permit the fibres to felt and interlace or interlock with each other and also with the fabric backing.

I claim as my invention:

1. A process of making felted fibrous compositions consisting in feeding an open mesh fabric backing over a paper forming machine forming thereon fibrous stock in an aqueous vehicle thereby causing the stock to felt and interlock with the fabric backing, and simultaneously with said operation introducing a waterproof pitchy binder.

.said pitchy binder being in the form of at non-adhesive emulsion while in the aqueous vehicle and during the felting operation.

3. A product of the character described,

consisting in a fabric backing sheet and a felted waterproof fibrous body the fibres of which are interlocked with the meshes of the fabric sheet and a waterproof bituminous adhesive binder uniting the fibers to the fabric sheet.

4. A product of the character described, consisting of a fabric backing sheet upon which has been formed and to which is integrally united a felted fibrous body of paper stock containing a waterproof pitchy binder.

5. A process of making a felted fibrous composition consisting in passing an open mesh fabric sheet through a vat containing paper stock in an aqueous vehicle, causing the paper stock to felt on the fabric, removing the water and drying the sheet and impregnating the product with an adhesive waterproof binder introduced as a non-adhesive emulsion during said felting operation.

6. A reenforced fibrous composition sheet comprising an open mesh body portion and a fibrous composition adhering thereto and comprising fibres coated with a bituminous material, said fibres being permanently felted.

7. A reenforced fibrous composition sheet comprising an open mesh body portion and a fibrous composition adhering thereto and comprising fibres coated with a bituminous material, said fibres bong permanently felted, said fibrous composition passing through the meshes of the reenforce.

LESTER KIRSCHBRAUN. 

